Tire

Abstract

A tire having excellent motion performance on both a dry road surface and a wet road surface. A tire includes a tread having a tread surface on which one or more land portions are defined by two or more circumferential grooves extending in a circumferential direction of the tread, wherein the one or more land portions each have a plurality of sipes extending in a direction traversing an equator of the tire and spaced from each other in the circumferential direction of the tread, and a dynamic elastic modulus E′ at 30° C. of a rubber composition forming the one or more land portions, a number N of the plurality of sipes, and a depth D of the circumferential grooves satisfy 0.009≤E′/(N×D)≤0.029.

1 . A tire comprising
 a tread having a tread surface on which one or more land portions are defined by two or more circumferential grooves extending in a circumferential direction of the tread,   wherein the one or more land portions each have a plurality of sipes extending in a direction traversing an equator of the tire and spaced from each other in the circumferential direction of the tread, and   a dynamic elastic modulus E′ at 30° C. of a rubber composition forming the one or more land portions, a number N of the plurality of sipes, and a depth D of the circumferential grooves satisfy the following expression:
   0.009 ≤E ′/( N×D )≤0.029.
 
   
     
     
         2 . The tire according to  claim 1 ,
 wherein a total length of the one or more land portions in a width direction of the tread is in a range of 28% to 48% of a total width of the tread.   
     
     
         3 . The tire according to  claim 1 ,
 wherein the circumferential grooves include four circumferential grooves, the one or more land portions include three land portions, and a width of a land portion at a center of the three land portions is in a range of 90% to 130% of a width of each of land portions on both sides thereof.   
     
     
         4 . The tire according to  claim 3 ,
 wherein the land portion at the center is located on the equator of the tire.   
     
     
         5 . The tire according to  claim 1 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044≤ D   0   /D≤ 0.155.
 
   
     
     
         6 . The tire according to  claim 2 ,
 wherein the circumferential grooves include four circumferential grooves, the one or more land portions include three land portions, and a width of a land portion at a center of the three land portions is in a range of 90% to 130% of a width of each of land portions on both sides thereof.   
     
     
         7 . The tire according to  claim 6 ,
 wherein the land portion at the center is located on the equator of the tire.   
     
     
         8 . The tire according to  claim 2 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044≤ D   0   /D≤ 0.155.
 
   
     
     
         9 . The tire according to  claim 3 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044≤ D   0   /D≤ 0.155.
 
   
     
     
         10 . The tire according to  claim 4 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044≤ D   0   /D≤ 0.155.
 
   
     
     
         11 . The tire according to  claim 6 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044 ≤D   0   /D≤ 0.155. 
   
     
     
         12 . The tire according to  claim 7 ,
 wherein the one or more land portions each have an apex at which a cross section in a width direction of the tread projects most outward in a radial direction of the tire, and   a distance D 0  between the apex and an opening edge of each of the circumferential grooves in the radial direction of the tire and the depth D of the circumferential grooves satisfy the following expression:
   0.044≤ D   0   /D≤ 0.155.